Internal-combustion engine



1929. E. R. BURTNETT 1,731,230

INTERNAL "comsus'nou ENGINE Filed Jan. 24, 1927 2 Sheets-Sheet l Oct. 8, 1929.

E. R. BURTNETT INTERNAL COMBUSTION ENGINE Filed Jan. 24, 1927 2 Sheets-Sheet 2 INVENTOR Patented Oct. 8, 1929 warren STATES PATENT OFFICE EVERETT R. BURTNE'IT. OF LOS ANGELES, CALIFORNIA, ASSIGNOR TO THE AUTO- MOTIVE VALVES CORPORATION, OF RENO, NEVADA, A CORPORATION OF NEVADA.

INTERNAL-COMBUSTION ENGINE ,Application filed January 24, 1927. Serial No. 163,110.

My invention relates to internal combustion engines and particularly to eight cylinder two stroke cycle internal combustion engines wherein the cylinders are arranged in V formation with a crank shaft of the four crank two plane type.

The principal object of my invention is to arrange the four cranks of the crank shaft in a manner which will provide a spacing of the eight pistons in separate reciprocatory positions relatively with res ect to their respective stroke movement in direction, providing thereby singular function at any given time in any of the eight cylinders but successive function of a given naturein equally spaced time within each of the eight cylinders once by every 360 of crank shaft rotation.

The object of the invention being accom plished by arranging the eight cylinders in two rows, of four cylinders arranged in each row and of spacing the two rows of cylinders respectively 90 apart, of forming the crank shaft with four cranks with the first and sec- 0nd cranks from a given end of the crank shaft relatively rotatively spaced apart instead of 90 apart as is the practice in con ventional 90 V arranged eight cylinder engines wherein a four crank two plane crank shaft is employed.

To form the first and second cranks from the other end respectively rotatively 45 apart, with the first cranks from each end relativelyspaced rotatively 180 apart and with the second cranks from each end of the crank shaft relatively spaced rotatively 180 apart. e a

This arrangement provides that only one piston of the eight pistons of the eight V disposed cylinders will reach a given position at one time and that another piston will occupy any given position of the two strokes of reciprocatory movement each 45 of crank shaft rotation.

Further this arrangement permits the counter balancing of the primary forces resulting from the stroke movement of the re ciprocatory members and the reduction of the v secondary unbalanced forces relatively with the secondary forces as developed in an eight cylinder V engine employing a four crank single plane crank shaft. vides in a two stroke cycle engine of eight cylinders eight equally spaced power impulses with rotative spacing of 45.

In a construction of my improved invention, the primary forces can be perfectly balanced, the secondary forces will be only seventy percent (70%) of the secondary forces a V eight cylinder engine in which the single plane four crank pin crank shaft is employed and it is obvious that to provide a given power, combustion being provided once in each cylinder each revolution of the crank shaft in two cycle principle that the reciprocative weights would be greatly reduced, also the couple, which in turn would further re duce the relative secondary forces comparatively with the secondary forces in the conventional 90 V eight cylinder engine with'single plane crank shaft.

An engine built in accordance with my improved construction will provide a vastly improved torque, being of few parts and easily manufactured.

With the'foregoing and other objects in View, my invention consists in certain novel features of construction and arrangement of parts that will be hereinafter more fully described and claimed and illustrated in the accompanying drawings in which: r

Fig. 1 is a vertical cross section taken transversely of the engine, the cutting edge being taken through the center of a 90 V disposed pair of combustion cylinders.

Fig. 2 is a longitudinal section taken on line 2-2 of Fig. 1, the cutting line being taken through the center of the row of four cylin- Further, it pro ders and the crank shaft, the other of the two 7 rows being of duplicate construction.-

Fig. 3 is an elevational view taken endwise with respect to the axis of the crank shaft,

the first crank from the end being shown in section and the relative spacing of the four cranks being indicated by lines intersecting the axis of the crank shaft and the respective- Referring by numerals to the accompanying drawings: 10 and 11 designate the two V disposed cylinder blocks, in each block four combustion cylinders 12 are arranged four cylinders in a row, the axes of the four cylinders of each row are parallel and the axes of the four cylinders arranged in one row being of radially, relatively 90 apart of the axes of the four cylinders of the other row.

Surmounting the two cylinder blocks 10 and 11 is a crank case 13, a crank shaft 14 is suitably journalled in main bearings 1516 and 17, which are secured in the crank case 13.

Eight main working pistons 18 are arranged one within each of the eight combustion cylinders 12 for reciprocatory movement bustion and piston and eight piston valves 19 are arranged one within each piston valve cylinder 20 formed to the side of and associated with each working cylinder 12.

Four cranks 21, 22, 23 and 24 are formed of the crank shaft 14, connecting rods 25 join the eight main working pistons 18 with the four cranks of the crank shaft, there being two pistons of the two cylinders of a given plane in which two V disposed cylinders are located connected to each of the four cranks of the crank shaft 14.

Exhaust ports 26 are formed through the wall of each of the eight combustion cylinders 12 and inlet ports 27 formed through the wall of each of the eight piston valve cylinders 20.

A common compression clearance chamber 28 joins the chambers of each adjacent comvalve cylinder.

An auxiliary crank shaft 29 is provided to actuate the piston valves in successive two stroke cycle time relation with the main power pistons.

It will be understood that the valve construction or type of valve illustrated and described in associatlon with my present 1nvention in no way is related to the spirlt of my invention, it being merely descriptive of a complete working two stroke cycle engine defining one way of providing inlet port and valvular means to the combustion cylinders.

Counter weights 30 and 31 are suspended with the mean center of counter weight disposed diametrically opposite the mean center between each adjacent pair of relatively spaced cranks, the principal of counterbalancing the reciprocatory forces and rotary mass aspracticed 1n the conventlonal 90 V eight cylinder engine with four cranks of the crank shaft relatively spaced 90 apart and arranged in two planes is not altered in its application as a formula in the case of balancing the like forces in an engine constructed in accordance with my present invention.

The operation of my improved engine is in efiect novel principally in the unusual relative positions of the four pistons of the four cylinders of one row, the first pistons from each end of a given row being relatively of opposite movement and position, the second pistons from each end of a given row being relatively of opposite movement and position and the second pistons from each end following or leading as the relative advance or lag arrangement may be correspondingly in position and movement the resultant of the relative 45 adjacent crank position.

It will be understood that minor changes in the size, form and construction of my improved engine may be made and substituted for those herein described without departing from the spirit of the invention, the scope of which is set forth in the appended claims.

I claim as my invention:

1. In a two stroke cycle internal combustion engine, the combination with eight main cylinders arranged in two rows with four cylinders in a row, and the two rows being disposed 90 apart, of a crank shaft having four cranks the first and second cranks from a given end of the crank shaft being spaced 45 apart, the first and second cranks from the other end of the crank shaft being disposed 45 apart, the first cranks from each end being spaced 180 apart, the second cranks from each end beiiig spaced 180 apart, the first and third cranks from either end of the shaft being spaced 135 apart; pistons arranged for operation within the eight main cylinders, and separate connections from the eight pistons to the four crank shafts, two pistons, one from each of the two rows of cylinders being connected to each crank throw.

2. In a two-stroke cycle internal combustion engine, the combination with eight main cylinders arranged in two rows with four cylinders in each row, and the two rows being disposed 90 apart, of a crank shaft having four throws, the first and second throws from a given end of said crank shaft 45 apart, the first and second throws from the other end of the shaft being disposed 45 apart, the first throws from both ends of the shaft being spaced 180 apart, the second throws from both ends of the shaft being spaced 180 apart, the first and third throws from both ends of the shaft being spaced 135 apart, counterbalancingweights carried by the crank shaft andarranged between the first and second throws from each end of the shaft, said counterbalancing weights being disposed 180 apart, andon medial lines between the throws that are disposed 45 being spaced apart, pistons arranged foroperation within 

